考虑不同方向地震作用时土石坝动力反应分析
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摘要
对Abaqus软件进行二次开发,引入等效线性模型,对某心墙堆石坝进行了三维有限元地震反应分析,研究了大坝在VII度地震下的加速度、动剪应力、相对动位移等反应规律。同时,分别对该坝考虑三向地震波输入及仅两个水平向地震波输入情况下的地震动力反应进行了计算比较,研究竖向地震加速度在VII度地震下对大坝的影响。结果表明:VII度地震情况下竖向地震波对土石坝顺河向和坝轴向的动力反应几乎没有影响,但是对竖向的影响不可忽略。
Through the implemention of equivalent linear elastic model into Abaqus,the paper analyzed the dynamic response of a rock-fill dam in detail by 3D FEM and researched the response rules of the maximum acceleration,the maximum dynamic shear strain,as well as the maximum relative dynamic displacement under the role of earthquake of seven degree.At the same time,it calculated and compared the seismic dynamic response of the dam in two different conditions such as input of X,Y horizontal seismic waves,and input of seismic waves of X,Y,Z directions respectively.It also studied the impact of vertical seismic acceleration on dam under rule of earthquake of seven degree.Result shows that the vertical seismic wave barely has influence on dynamic response in horizontal directions,but has huge influence in vertical direction.
Through the implemention of equivalent linear elastic model into Abaqus,the paper analyzed the dynamic response of a rock-fill dam in detail by 3D FEM and researched the response rules of the maximum acceleration,the maximum dynamic shear strain,as well as the maximum relative dynamic displacement under the role of earthquake of seven degree.At the same time,it calculated and compared the seismic dynamic response of the dam in two different conditions such as input of X,Y horizontal seismic waves,and input of seismic waves of X,Y,Z directions respectively.It also studied the impact of vertical seismic acceleration on dam under rule of earthquake of seven degree.Result shows that the vertical seismic wave barely has influence on dynamic response in horizontal directions,but has huge influence in vertical direction.
引文
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[3]Ang S H,Tang W H.Probability concepts in engineeringplanning and design[M].New York:John Wiley&Sons,1990.
[4]Guan Zhicheng.Investigation of the 5.12 Wenchuan earth-quake damages to the Zipingpu water control project and anassessment of its safety state[J].Science China Technolog-ical Sciences,2009,52(4):820-834.
[5]Zhang Jianfeng,Andrus R D,Juang C H.Normalizedshear modulus and material damping ratio relationships[J].Journal of Geotechnical and Geoenvironmental Engi-neering,2005,131(4):453-464.
[6]费康,张建伟.ABAQUS在岩土工程中的应用[M].北京:中国水利水电出版社,2010.1.
[7]徐志英,沈珠江.高尾矿坝的静、动力非线性分析与地震稳定性[J].华东水利学院学报,1980(4):12-17.
[8]卢廷浩,邵松桂.天生桥一级水电站面板堆石坝三维非线性有限元分析[J].红水河,1996,15(4):20-22.
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